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First, attention should be paid to the capacitive reactance and inductive reactance of cables and field devices. Intrinsically safe explosion protection is system explosion protection. In addition to the safety barriers required to reach the required explosion protection level, the energy storage of cables and field devices is also a key issue, especially It is after the certification of the parametric authentication alternative system that the engineering company pays special attention to this issue.
Second, pay attention to the intrinsically safe grounding. The Zener safety barrier needs to be intrinsically safe and the grounding resistance should be less than 1.
Third, intrinsically safe cables and non-intrinsically safe cables should be laid separately in different trunkings and should be clearly marked.
Fourth, attention should be paid to the switch off.
Fieldbus is favored by engineers because of its simple structure, easy expansion, and cost savings. However, it is not easy to be promoted in the petrochemical industry. The reasons are mainly the following:
First, the petrochemical industry has 70% to 80% of the dangerous areas. Explosion protection is a top priority for petrochemical automation. The safety barrier is an effective part to control the energy of the site, but it also limits the capacity of the bus equipment, so that the main advantages of the field bus can not be reflected.
Second, due to the special nature of the site, field devices cannot be charged and maintained, and the development of the fieldbus is also restricted.
Third, smart meters with explosion-proof functions have not yet been popularized, and they are also one of the reasons why the field bus is not well developed in the petrochemical industry.
Fourthly, the domestic DCS system is maturing, and the field bus in the development stage is also at a disadvantage in the petrochemical industry. If the petrochemical automation system collapses, it will bring huge losses to the company, which further determines that the failure of the petrochemical industry will not affect the use of Other equipment, and more mature DCS system. Of course, the advantages of the on-site system have been accepted by people. The application in the petrochemical industry will also be a matter of morning and evening. This depends on the efforts of FCS manufacturers and other related industries.
In addition to choosing the appropriate safety barrier, the Intrinsically Safe system should pay attention to the following aspects when it is used: